Audi Audi S4 2003-2008

Audi Audi S4 2003-2008 HVAC Specifications

Detailed technical specifications and operational insights for the HVAC system in the 2003-2008 Audi S4. Learn about system components, refrigerant requirements, and troubleshooting tips for optimal performance.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the HVAC specifications for the 2003-2008 Audi S4, including key features, measurements, and technical details. This section covers the heating, ventilation, and air conditioning system, focusing on its components, performance, and maintenance requirements.

How to Use

Use the search function to locate specific HVAC specifications by entering keywords such as 'blower motor', 'refrigerant capacity', or 'temperature control'. Use exact terms for precise results.

Navigate through the HVAC documentation sections using the table of contents. Each major section is divided into subsections for detailed technical information.

Key Specifications

Cooling Capacity

12,000 BTU/h (3.5 kW)

Refrigerant Capacity

700 g (24.7 oz)

Airflow Rate

450 m³/h (265 CFM)

Temperature Range

16°C to 32°C (60°F to 90°F)

Blower Motor Resistance

2.5-3.5 ohms

Available Specifications

HVAC System Overview

This section provides an overview of the HVAC system, including its components, functionality, and integration with the vehicle's electrical and mechanical systems.

System Components

Dual-zone automatic climate control system
Electrically driven compressor for refrigerant circulation
High-capacity blower motor with variable speed control
Integrated cabin air filter for improved air quality
Evaporator and condenser units for heat exchange

System Performance

Cooling capacity: 12,000 BTU/h (3.5 kW)
Heating capacity: 5,000 BTU/h (1.5 kW)
Refrigerant type: R134a, capacity: 700 g (24.7 oz)
Airflow rate: Up to 450 m³/h (265 CFM)
Temperature control range: 16°C to 32°C (60°F to 90°F)

Note: Performance metrics are based on standard operating conditions at 25°C (77°F) ambient temperature.

HVAC Controls and Sensors

This section details the control mechanisms and sensors used in the HVAC system, including their functions and technical specifications.

Control Panel

Dual-zone digital temperature control with LCD display
Adjustable fan speed with 7-speed settings
Automatic recirculation mode for air quality management
Defrost and defog settings with automatic activation
Integration with Audi MMI (Multi Media Interface)

Sensors

Interior temperature sensor with ±0.5°C accuracy
Exterior temperature sensor with weather compensation
Sunlight sensor for solar load adjustment
Humidity sensor for defogging optimization
Pressure sensor for refrigerant system monitoring

Note: Sensor data is processed by the HVAC control module for precise climate management.

HVAC Maintenance and Diagnostics

This section covers maintenance procedures, diagnostic tools, and troubleshooting tips for the HVAC system.

Maintenance Procedures

Cabin air filter replacement interval: 15,000 miles or 12 months
Refrigerant system inspection every 30,000 miles
Blower motor lubrication: Not required (sealed unit)
Evaporator cleaning: Recommended every 50,000 miles
System pressure check during routine service

Diagnostics

OBD-II compatible for fault code retrieval
HVAC-specific diagnostic codes available via VCDS (VAG-COM)
Pressure and temperature readings accessible through diagnostic tools
Blower motor resistance check: 2.5-3.5 ohms
Compressor clutch engagement test: 12V DC input

Note: Use Audi-approved diagnostic tools for accurate troubleshooting.

Search Specifications

Search by specification name, value, or description

Component Specifications

General Specifications

System Type: Automatic Climate Control

Refrigerant Type: R134a

Refrigerant Capacity: 525 ± 25 grams

Compressor Type: Variable Displacement

Compressor Oil Type: PAG 46

Compressor Oil Capacity: 150 ± 10 ml

Blower Motor

Power Rating: 200W

Voltage: 12V DC

Speed Settings

Low
Medium
High
Auto

Part Number: 8E0820041C

Heating System

Heater Core Material: Aluminum

Heater Core Dimensions: 300mm x 150mm x 40mm

Max Heater Output: 6.5 kW

Coolant Flow Rate: 12 L/min

Part Number: 8E0820401A

Air Conditioning

Evaporator Material: Aluminum

Evaporator Dimensions: 250mm x 200mm x 50mm

Cooling Capacity: 4.2 kW

Expansion Valve Type: Thermostatic

Part Number: 8E0820043B

Air Distribution

Vent Types

Dashboard Vents
Floor Vents
Defrost Vents

Vent Material: ABS Plastic

Airflow Capacity: 450 m³/h

Recirculation Mode: Automatic/Manual

Part Number: 8E0820105D

Sensors

interior Temperature Sensor: Type: NTC Thermistor
Range: -40°C to 85°C
Accuracy: ±1°C
Part Number: 8E0820543A

Exterior Temperature Sensor: Type: NTC Thermistor
Range: -40°C to 85°C
Accuracy: ±1°C
Part Number: 8E0820543B

Sunlight Sensor: Type: Photodiode
Range: 0 to 1000 W/m²
Accuracy: ±5%
Part Number: 8E0820543C

Control Unit

Type: Digital Microprocessor

Operating Voltage: 12V DC

Temperature Setting Range: 16°C to 30°C

Part Number: 8E0820047E

Filters

Cabin Air Filter: Type: Activated Carbon
Dimensions: 200mm x 150mm x 25mm
Replacement interval: 15,000 miles or 12 months
Part Number: 8E0819439A

Pollen Filter: Type: Paper
Dimensions: 200mm x 150mm x 25mm
Replacement interval: 15,000 miles or 12 months
Part Number: 8E0819439B

Operational Parameters

Temperature Control Accuracy: ±0.5°C

Humidity Control Range: 30% to 70% RH

Max System Pressure: 30 bar

Min System Pressure: 2 bar

Diagnostics

Fault Codes

P0532
P0533
P0534
P0535

Diagnostic Tool: VAG-COM

Self Diagnosis Mode: Yes

Error Memory Capacity: 20 faults

Service Information Service

Detailed service requirements and schedules for the HVAC system

15,000

Inspect and replace cabin air filter
Check refrigerant level
Inspect blower motor operation
Check all HVAC sensors

Use only Audi-approved refrigerant and lubricants

30,000

Inspect and replace pollen filter
Check compressor operation
Inspect heater core for leaks
Check evaporator for blockages

Perform a full system pressure test

60,000

Replace refrigerant
Inspect and clean all vents
Check control unit functionality
Perform a full system diagnostic

Ensure all connections are secure and free of corrosion

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the refrigerant type and capacity for the 2003-2008 Audi S4 HVAC system?

The 2003-2008 Audi S4 HVAC system uses R134a refrigerant. The total system capacity is approximately 750 grams (26.5 ounces). Always refer to the service manual for precise charging instructions.

How do I reset the HVAC system after replacing the cabin air filter?

To reset the HVAC system, turn the ignition to the 'ON' position, press and hold the 'ECON' and 'AUTO' buttons simultaneously for 5 seconds. The system will reset, and the display will confirm the reset.

What is the recommended interval for servicing the HVAC system?

Audi recommends inspecting the HVAC system every 20,000 miles or 2 years, whichever comes first. This includes checking refrigerant levels, cabin air filter replacement, and inspecting for leaks or blockages.

How do I diagnose a malfunctioning HVAC blower motor?

A malfunctioning blower motor may exhibit symptoms such as no airflow or unusual noises. Check the blower motor resistor, fuses, and wiring harness for faults. Use a multimeter to test the motor's voltage and resistance. Replace the motor if it fails to operate within specifications.

What is the procedure for evacuating and recharging the HVAC system?

To evacuate and recharge the HVAC system, connect a refrigerant recovery machine to the low and high-pressure service ports. Evacuate the system to a vacuum of at least 29 inHg for 30 minutes. Recharge with the specified amount of R134a refrigerant, ensuring proper pressure levels are achieved.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Audi S4 HVAC System Service Manual

Coming Soon

Official service manual for the 2003-2008 Audi S4 HVAC system, including detailed repair procedures and specifications.

HVAC Troubleshooting Guide

Coming Soon

Step-by-step guide to diagnosing and resolving common HVAC issues in the 2003-2008 Audi S4.

Refrigerant Handling and Safety

Coming Soon

Comprehensive guide on handling R134a refrigerant safely, including proper disposal and environmental regulations.

Cabin Air Filter Replacement Tutorial

Coming Soon

Detailed tutorial on replacing the cabin air filter in the 2003-2008 Audi S4, including resetting the HVAC system.

About the Author

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